Reactive material enhanced projectiles and related methods

• US 9,103,641 B2
• Filed: 02/14/2012
• Issued: 08/11/2015
• Est. Priority Date: 02/23/2000
• Status: Active Grant

• Current Assignee: Northrop Grumman Systems Corporation (Northrop Grumman Corporation)
• Original Assignee: Orbital ATK Inc.
• Inventors: Nielson, Daniel B., Truitt, Richard M., Ashcroft, Benjamin N.
• Primary Examiner(s): Bergin, James S
• Application Number:
  US13/372,804
• Publication Number:
  US 20120167793A1
• Time in Patent Office: 1,274 Days
• Field of Search: 102/364, 102/516, 102/517, 102/518, 102/501
• US Class Current: 1/1
• CPC Class Codes: C06B 45/00 Compositions or products which are defined by structure or arrangement of component of product explosive charges of particular form or shape F42B1/00, F42B3/00
• CPC Class Codes: C06B 45/12 having contiguous layers or zones
• CPC Class Codes: F42B 12/06 with hard or heavy core; Kinetic energy penetrators F42B12/16, F42B12/74 take precedence
• CPC Class Codes: F42B 12/204 for attacking structures, e.g. specific buildings or fortifications, ships or vehicles
• CPC Class Codes: F42B 12/36 for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
• CPC Class Codes: F42B 12/44 of incendiary type F42B12/46 takes precedence
• CPC Class Codes: F42B 12/74 of the core or solid body
• CPC Class Codes: F42B 33/00 Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor F42B5/188 takes precedence; manufacturing processes for hollow charges F42B1/036; manufacture of blasting cartridge initiators F42B3/195
• CPC Class Codes: F42B 33/001 Devices or processes for assembling ammunition, cartridges or cartridge elements from parts
• CPC Class Codes: F42B 5/02 Cartridges, i.e. cases with charge and missile

Abstract

A munition, such as a projectile formed of at least one reactive material. In one embodiment, the projectile includes a body portion formed of at least one reactive material composition wherein the at least one reactive material composition defines at least a portion of an exterior surface of the projectile. In other words, a portion of the reactive material may be left “unbuffered” or exposed to the barrel of a gun or weapon from which it is launched and similarly exposed to a target with which the projectile subsequently impacts. In one embodiment, the projectile may be formed with a jacket surrounding a portion of the reactive material to provide additional structural integrity. The projectile may be formed by casting or pressing the reactive material into a desired shape, or the reactive material may be extruded into a near-net shape and then machined into the desired shape.

Claims

1. A projectile, comprising:

a first reactive material; and

a second reactive material disposed at a first end of the first reactive material and proximate an intended leading end of the projectile;

wherein the second reactive material is more sensitive to initiation upon impact of the projectile than is the first reactive material, the first reactive material comprising a tip extending into the second reactive material, the second reactive material directly contacting the first reactive material along a non-planar interface and along substantially all of the tip, wherein all surfaces of the second reactive material directly contact at least one of the first reactive material and an inner surface of a jacket disposed about the second reactive material.

2. The projectile of claim 1, wherein the jacket is disposed about at least a portion of the first reactive material.

3. The projectile of claim 1, wherein the jacket is disposed substantially about the first reactive material and the second reactive material, the jacket defining an opening adjacent the first reactive material at a second end opposite the first end;

and

a closure hermetically sealing the opening defined by the jacket.

4. The projectile of claim 1, wherein the jacket is formed of a material comprising at least one of copper and steel.

5. The projectile of claim 1, wherein the first reactive material comprises at least one of a fuel, an oxidizer, and a binder.

6. The projectile of claim 1, wherein the second reactive material includes copper.

7. The projectile of claim 1, wherein the first reactive material comprises a first formulation and the second reactive material comprises a second formulation different from the first formulation.

8. The projectile of claim 1, wherein each of the first reactive material and the second reactive material comprises at least one fuel and at least one binder.

9. The projectile of claim 8, wherein the at least one binder comprises at least one of a urethane binder, an epoxy binder and a polymer binder.

10. The projectile of claim 8, wherein the at least one fuel comprises at least one of a metal, an intermetallic material, and a thermitic composition.

11. The projectile of claim 8, wherein at least one of the first reactive material and the second reactive material further comprises at least one oxidizer.

12. The projectile of claim 11, wherein the at least one oxidizer comprises at least one of ammonium perchlorate, an alkali metal perchlorate, lithium nitrate, sodium nitrate, potassium nitrate, rubidium nitrate, cesium nitrate, strontium nitrate, barium nitrate, barium and strontium peroxide.

13. The projectile of claim 1, further comprising a core member.

14. The projectile of claim 13, wherein the core member is substantially surrounded by at least one of the first reactive material and the second reactive material.

15. The projectile of claim 13, wherein the core member comprises a material that is denser than the at least one of the first reactive material and the second reactive material.

16. The projectile of claim 15, wherein the core member comprises tungsten.

17. The projectile of claim 1, wherein the jacket is substantially continuous and substantially covers the first reactive material and the second reactive material, and is disposed about at least a portion of each of the first reactive material and the second reactive material.

18. A method of forming a projectile, the method comprising:

forming a body from at least one reactive material composition comprised of a first reactive material and at least a second reactive material that is more sensitive to initiation upon impact of the projectile than is the first reactive material, wherein the first reactive material is reactive with the at least a second reactive material, forming the body comprising;

forming the at least a second reactive material at a first end of the first reactive material and proximate an intended leading end of the projectile;

forming a tip of the first reactive material extending into the at least a second reactive material and forming the at least a second reactive material directly contacting the first reactive material along a non-planar interface with the first reactive material and along substantially all of the tip; and

forming all surfaces of the at least a second reactive material to directly contact at least one of the first reactive material and an inner surface of a jacket disposed about the at least a second reactive material.

19. The method according to claim 18, wherein forming a body further includes casting the at least one reactive material composition into a desired shape.

20. The method according to claim 19, wherein the casting is performed under a vacuum.

21. The method according to claim 19, wherein the casting is performed under pressure.

22. The method according to claim 18, wherein forming a body further includes extruding the at least one reactive material composition.

23. The method according to claim 22, wherein extruding further includes extruding the at least one reactive material into a near-net shape and wherein the method further comprises machining the near-net shape into a desired shape.

24. The method according to claim 18, wherein forming a body further comprises pressing the reactive material composition into a desired shape.

25. The method according to claim 18, wherein forming a body from at least one reactive material composition further includes forming a body portion from a first reactive material and a core member from a second material.

26. The method according to claim 25, wherein forming a body portion from a first reactive material and a core member from a second material includes forming the core member of the at least a second reactive material.

27. The method according to claim 25, wherein forming a body portion from a first reactive material and a core member from a second material includes forming the core member of a material that is denser than the first reactive material.

28. The method according to claim 27, wherein forming a body portion from a first reactive material and a core member from a second material includes forming the core member of a material that includes tungsten.

29. The method according to claim 18, wherein forming a body from at least one reactive material composition further includes providing at least one reactive material composition comprising at least one fuel, at least one oxidizer and at least one binder.